Oldenburg Sweden

In OTL, Sweden lost Finland to Russia in a 1809 war, and Gustav IV Adolf/Gustavus IV Adolphus was dethroned, which eventually led to the Bernadotte dynasty in Sweden, and the union between Sweden and Norway (1814-1905). In this timeline, Sweden was on Napoleon's side until it shifted sides. The Swedish forces were led by a French general, Jean Bernadotte (Charles XIV John of Sweden and Norway in OTL), who after the war settled in Sweden and was created a Swedish Count. In this timeline, Sweden kept Finland, and the throne stayed with the old dynasty and its descendants. Also, Sweden conquered parts of Denmark and Norway.